Rivet-heating furnace.



w. H. DIFFENDALIL.

RIVET HEATING FURNACE.' APPLICATION map MAR.9.1911.

Patented. hm@ 26, 19H

1,5 Q y Q WALTER H. DIFFENDALL, or HAsEnsTowN," MARYLAND.

RIVET-HEATING FURNACE.

Specification of Letters Patent. Patentgd Jun@ 26 119117,

Application led March 9, 1917. Serial N o. 153,598.

' DALL, a citizen of the United States, residing at Hagerstown, in thecounty of Washington and State of Maryland, have invented cert-ain newand useful Improvements in Rivet-Heating Furnaces; and I hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompanying drawings, which.

form part of this specification.

This invention is av novel portable furnace, especially designed forheating rivets, such as are used in structural iron work. The furnace isdesigned to be heated by oil, or hydrocarbon mixtures, or gas.

The object of the invention is to produce a furnace which is not.complicated; which can be easily operated, and can be easily repaired,and the parts replaced if damaged; and which can be readily adapted forheating different sizes of rivets quickly and economically.

l will explain a practical embodiment of the invention` illustrated inthe accompany ing drawings, in detail and refer to the claims forsummaries of the essential features and combination of parts for whichprotection is desired.

Referring to the accompanying drawings:

Figure 1 is ayertical-'sectional `elevation of the complete furnace.

Fig. 2 is a detail top plan view.

Fig. 3 is a view of the lower half of the furnace withthe top portionremoved.

Fig. 4 is a detail sectional view taken on line 4-4 of Fig. 3.

The furnace proper consists of a cylindrical body comprising an uppersection 4 and a lower section 5. The lower section 5 is annular, and isfour legs 8, whic may be made of pipe and the upper ends of these legsare inserted in sockets 5a in the section 5 and secured therein by tapbolts 5b as indicated in Figs. 3 and 4.

The interior of section 5 is preferably tapered or conical, being largerin diameter at bottom than at top; and this section may be provided witha plurality of perforated ears or lugs 5l on its outer side,l as in Fig.3. for a purpose hereinafter referred to. The section 5 may also beprovided with an annular rib 5e on its upper side adapted to interlockwith a corresponding rib 4f OD. the Upper Section 4 0f the .Casing-jpreferably supported upon The upper section 4 of the furnace ispreferably cylindrical, and is mounted upon the section 5, resting uponthe rib 5e and having a flange 4e interlocking with rib 5e as shown inFig.` 1. Said upper section has a series of perforated lugs or ears 4con its lower end opposite the perforated lugs 5c on the lower section;and the sections 4 and 5 may be firmly but detachably united by means ofbolts 3 passed through the opposed lugs 4, 5 and secured by nuts 3a' asshown. The section 4 also has on its upper end a series of perforatedlugs 4f.

The section 4 may be provided with eyes 4g on its sides to facilitatehandling or transy port of the upper section, or of the furnace.

On the upper end of the section 4 is a cover plate 1 which is removable;this plate may be of any desired shape, but is shown as flat. It isprovided with a series of perforations 1f which are adapted to come oplposite the perforated lugs 4f, and the top plate may be detachablysecured to the section 4 by means of bolts 2 passed through theperforations 1t and. lugs 4f, which bolts may be fastened by keys 2' asindicated in the drawings, or by other suitable means.

The top plate 1 is provided with a series of perforations 1b which arepreferably slightly larger in diameter than the Shanks of the rivets tobe heated, but smaller than the heads of such rivets,'so that a seriesof rivets to be heated may be suspended in the furnace from the topplate in position to be heated by dropping their Shanks through theopenings 1b as indicated in Fig. 1 while the heads of the rivets closethe openings. If desired a refractory packing 1e of any suitablematerial may be interposed between the'- upper ends of the section 4 andthe plate 1;

The plates .1 are made interchangeable. A plate having openingscorresponding to the size of the Shanks of the rivets to be heatedshould be used. These plates can be readily interchanged, and one havingopenings of the desired size fastened to the section 4. plates withsmall openings will be provided,

if larger rivets plates with larger openings will be used.

The burner or gasier is preferably formed of a pipe coiled upon itselfinto a flat coil as shown at 6 in Figs. 1 and 3, and having a centralupstanding portion 6a on which is fitted a cap 6" that is suitably per-yIf small 'rivets are used furnaces. l 'attached to and suspended fromthe section foratedA to permit the escape of gases through the coil intothe lower part ofthe The burner 6 may be detachably reaching the burner,by and suitable apparatus; which apparatus can'be located 'at anydesired distance from the furnace. The

outer member 6" of the coil may be detachably connected with the supplypipe P by means of a coupling Gf. In t is wa the oil tank or fuel supplycan be locatedY at any desired distance from the furnace so thattherewill be no danger of overheating the i oil or gas in the taille-,orignition of the fuel in the pipe 6 within the tank. A pan 9 for catchinscale or oil drippings may be mounted on t e le s 8 beneath the burner'6 as indicated 1n Fig. 1.`

If desired a control valve 6 may be placed so that the operator can outoff the supply of fuel to the burner at the furnace, in case the latteris located at a distance from the fuel supply or from the usualregulating valves, or incase of emergency.

When the furnace Vis fired the heating flame is directed upwardlyagainst plate l and part of the heat is reflected downward and heats theburner 6 gasifying the fuel.

The furnace is cheaply constructed and easily repaired; and if eithersection 4, or 5 should burn out,` or be inJured in any manner, it can bereadily replaced by a duplicate section.

Sufficient air for combustion is supplied through the space between theburner 6 and the lower end of the section 5.

By means of lthe' interchangeable top I plates the furnace can be veryeasil adjusted for heating rivets of anf'desire size. The rivets cannotfall into the re; the workman is protected from a great deal of theheat; and the ends of the shanks of the rivets (which are the main partsto be heated) are directly subjected to the most intense heat, while theheads practically remain comparatively cool.

What I claim is: i

1. A rivet heating furnace comprising a body composed of upper and lowerannular sections having interlocking Aribs and perforated lugs on theirmeeting ends, bolts engaging said lugs and connecting the sectionstogether, a top plate detachably attached to and closing the upper endof the body and having openings through which the Shanks of the rivetsmay be passed to suspend thelrivets within the upper section, and aburner beneath the lower section and discharging into the furnace.

2. Afrivet heating furnace comprising a body composed of upper and lowerannular sections provided with their meeting ends, and bolts translixingthese lugs and connecting the sections together, said upper section alsohaving perforated lugs near its upper end; a top plate perforated' lugson closing'thetop of'the upper section and at# ytached thereto by boltsengaging the lugs on the upper end of said section, said late beingperforated for the passage o the Shanks of the rivets; anda burnerdischarging into the. furnace.

3. A rivet heating furnace, comprising a body composed ofiupper andlower annular sections having interlocking ribs on their meetingendsa'nd radially projecting per.- forated lugs adjacent the ribs, andbolts transxing said lugs and connecting the sections together; saidupper section also having perforated lugs near its upper end;y a

top plate closing 4the upper end of the furnace and detachably attachedthereto by bolts engaging perforations in the plate and the lugs on theupper end of the upper section; said plate being provided witherforations for the passage of the Shanks of the rivets, and meansconnected with the lower section for supporting the furnace, and aburner suspended beneath the lower section and discharging into thefurnace,

`substantially as described;

In testimony that I claim the foregoing as my own, I affix my signature.

WALTER H. DIFVFENDALL.

